Rectilinear electromagnetic motor



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E. L. ROSE RECTILINEIAR ELECTROMAGNETIC MOTOR CmSS Referefim Filed May 27, 1931 I C !Q 7 5:45 W

I f T Jan. 3, 1933.

FIG 5 Patented Jan. 3, 1933 UNITED STATES PATENT OFFICE EDWIN L. ROSE, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO DAHLSTROM METALLIC DOOR COMPANY, OF J'AMESTOWN, NEW

YORK, A CORPORATION OF NEW YORK BEOTILINEAB ELECTROMAGNETIC MOTOR Application filed May 27,

This invention relates to an improvement in rectilinear motors and particularly to one which is adapted to operate on alternating current.

In its preferred embodiment this device reveals an induction motor, the field structure of which comprises a substantially rectangular laminated iron core. This core is formed by two adjacent pairs of horizontal rails which are spacedly joined together through vertical members. Surroundin each of the vertical members is a coil whic is connected through a switch to a source of single-phase alternating current supply. The field structure thus formed may be mounted as a unit on the header of an entrance enclosure structure for the purpose of operating one or more sliding doors.

The armature of the motor comprises a single turn of metallic non-magnetic material of relatively high conductivity which loosely encircles the lower rail of the core, being supported by a bracket which is shown mounted on the top of a sliding door hanger.

The principal object of the invention is to provide a rectilinear motor which is simple in construction and operation.

Another object of the invention lies in the provision of a rectilinear motor which is rugged in design for the purpose of performing many kinds of useful work. A further object of the invention is to pro vide a portable rectilinear motor which, by reason of the twin arrangement of armatures, is adapted to operate bi-parting doors in an entrance enclosure structure.

Other and further objects of the invention will be more clearly understood from a consideration of the following specification which is taken in conjunction with the accompanying drawing, and which Fig. 1 shows one modification of the invention applied to and adapted to operate a pair of doors in a bi-parting door enclosure struc- Fig. 2 is a View similar to that of Figure 1, showing the doors in open osition;

Fig. 3 is a vertical sectional view taken substantially on the line 3-3 of Figure 2;

1981. Serial No. 540,360.

Fig. 4 is a horizontal sectional view taken substantially on the line 44 of Figure 1;

Fig. 5 is a plan view, showing the method of mounting the motor on the header;

Fig. 6 represents a wiring diagram show-- ing how coils may be connected through a switch to a source of current supply;

Fig. 7 shows another method of connection whsreby all coils may simultaneously be used; an

Fig. 8 is another diagram showin more efiicient results may be obtainedi serting a condenser in the circuit.

Referring particularly to Figures 1 and 2 of the drawing, this motor is shown mounted upon a header which is indicated by the reference numeral 10. The vertical wall 11 of the header terminates along the bottom in a horizontal flange 12 which may serve as a lintel for that portion of the wall above the door opening and also as an anchor for the header. A reversely disposed flange 13, which projects at right angle from the top of the wall 11, terminates in a short upwardly extending flange 14. The planes of the flange 14 and wall 11 define the limits within which the motor must be confined.

The field structure 16 of the motor comprises a laminated iron core 17 which is made up of adjacent horizontal rails 18 and 19. Vertical members 21 are secured to the ends of and spacedly join said rails together. Since the device, as shown, discloses the equivalent of two motors mounted as a unit, only three vertical members are necessary to join the adjacent rails to each other. The top rail 18 is provided with a. downwardly projecting portion 22. The bottom edge of this portion and the top edge of rail 19 define a narrow slot 23 which is divided by the center vertical member 21. Surrounding each vertical member 21 are coils 24, 26 and 27. The field structure is mounted on the vertical flange 11 of the header by brackets 28.

Loosely encircling the lower rail 19 are one or more armatures 29 which consist of a single turn of low resistance material. Armature 29 is capable of moving longitudinally of the core when coils 24, 26 and 27 are energized 100 6; proved by inserting a condenser from a suitable source of alternating current supply.

Horizontally mounted on the lower portion of the wall 11, by brackets 31, is a track 32. Rollers 33, which are supported in pendent plates 34, engage the track and permit longitudinal motion of said pendent plate relative to said track. Pendent plates 34: engage and support doors 36. Armatures 29 .are supported by brackets 37 which are mounted on the top edge of pendent plates 34.

As above stated, this motor is adapted to operate on single-phase alternating current supply. Coils 24, 26 and 27 may be connected to a source of current supply in several different ways, three of which have been indicated in Figures 6, 7 and 8 of the drawing. It will be noted (see Figure 6) that in order to move the armature in one direction, the switch is moved to the position which connects coil 26 to the current supply. The armature may be returned to its original position by throwing the switch in the opposite direction to connect coils 24 and 27 in circuit.

Referring to the wiring diagram shown in Figure 7 of the drawing, a more thorough understanding of the theory of operation of the device will be had from a consideration of the following explanation: The coils 24 and 26, when connected to a source of alternating current supply, produce like poles on the corresponding ends thereof. The major portion of the magnetic flux follows the path of the iron core. Assuming that the instantaneous polarity of upper ends 01 L h coils 24 and 26 is north, then the path of the magnetic circuit starts from each coil, follows the rail 17 through the portion 22, past the slot 23, into the rail 19, and then back to the original coil. Each coil has a. complete and independent magnetic circuit, the paths of which are substantially circular, and lie adjacent each other. Since the current in the coils is alternating, the magnetic flux in the slot 23 alfiux, passing through the slot 23. The alternating flux is cut by the coil 29 to induce a current therein which results in a magnetic field about the coil. This magnetic field reacts with the field in the slot 23 to cause motion of the coil 29 in one direction or the other.

Figure 7 illustrates how all three of the coils may be connected to-move the armatures in both directions. By throwing the switch from one position to the other, the coils are suitably energized to produce motion of the armatures in the desired direction.

The power factor of the electrical energy supplied to the device may be reatly imof proper proportions in series with the supply lines, as shown in the drawing (see Figure 8). A more precise design, however, may be obtained by putting a condenser in series with each winding instead of the single condenser C, where the two condensers are each proportional to their respective windings.

While applicant has shown and described but one modification of his invention, he does not intend to be limited thereto since it is obvious to those skilled in the art that other modifications or adaptations may be made without departing from the spirit and scope of the invention as set forth in the hereunto annexed claims.

Having thus set forth my invention what I claim as new and for which I desire protection by Letters Patent is:

1. In a rectilinear induction motor having a field structure including a core and primary coils, said core comprising two spaced parallel rails, vertical members connecting the ends of said rails, said rails and said members forming slots adjacent the ends of one of said rails. said slots opening into the space between said rails. and a secondary coil loosely mounted on one of said rails.

2. In a rectilinear induction motor having a field structure including a laminated core, a pair of spaced parallel rails, vertical members connecting the ends of said rails, said rails and said vertical members defining a slot extending longitudinally and laterally of said core, and a coil projecting through each of said slots.

3. A rectilinear induction motor having a field structure including a core comprising spaced parallel rails, vertical members connecting the ends of said rails, said rails and said vertical members defining longitudinally and laterally extendng slots in said core, a coil mounted on each of said vertical members and a secondary coil loosely encircling the other of said rails.

4. In an entrance door enclosure structure having bi-parting doors, a rectilinear induction motor attached to said enclosure, said motor including a field structure having spaced parallel rails, vertical members connecting the ends and centers of said rails, said rails and said vertical members defining laterally adjacent longitudinally extendin slots, a coil mounted on each of said vertica members, and secondary coils mounted on one of said rails, and projecting through one of said slots.

5. A rectilinear induction motor comprisin g an iron core having horizontal rails spacedly joined by vertical members, primary coils mounted on said members, a secondary coil slidably mounted on one of said rails, a source of alternating current supply and means connecting said primary coils with said current supply whereby to cause said secondary coil tomove along said rail.

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6. A rectilinear induction motor having an iron core comprising horizontal rails spacedly joined by vertical members, prlmary coils rigidly mounted on said members, a secondary coil slidably mounted on one of said rails, a source of alternating current supply and contact means for connecting said current supply with said primary coils, said means being adapted to control the direction of lmotion of said secondary coil along said rai 7. A rectilinear induction motor having an iron core, said core comprising a pair of horizontal rails spacedly joined by vertical members, an inwardly projecting portion formed on one of said rails, primary coils rigidly mounted on said members, a secondary coil slidably mounted on the other of said rails, a source of current supply, contact means for connectin said primary coils with said current supp y, said contact means being adapted to control the direction of motion of said secondary coil along said rail.

In testimony whereof I have aifixed my signature.

EDWIN L. ROSE. 

